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Filter expressions must return a boolean value. Anything in between these two tokens is treated as a filter expression. They allow the caller to retrieve data conditionally, similar to Perl's grep operator.įilters are specified using the '?(' token, terminated by ')'. Filteringįilters are the most powerful feature of JSONPath. Script expression, using the underlying script engine. JSONPath allows alternate names or array indices as a set. Union operator in XPath results in a combination of node sets. In Javascript and JSON it is the native array operator. XPath uses it to iterate over element collections and for predicates. All objects/elements regardless their names. The root object/element current object/element. Note that in JSONPath square brackets operate on the object or array addressed by the previous path fragment. Since a JSON structure is usually anonymous and doesn't necessarily have a "root member object" JSONPath assumes the abstract name $ assigned to the outer level object." JSONPath Expressionsįrom the spec: "JSONPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination with an XML document. JSONPath is a tool, similar to XPath for XML, that allows one to construct queries to pick out parts of a JSON structure.
Json query with scriptengine code#
This code implements the JSONPath specification at JSONPath specification. Set this to true in order to return the canonical path(s) to the elements matching the expression. Set this to true in order to return a reference to the matched portion of the object, rather than the value of the matched portion. evaluateĮvaluate a JSONPath expression on the object passed to the constructor. Currently the only supported argument is 'want_ref' - set this to true in order to return a reference to the matched portion of the object, rather than the value of that matched portion. JSONPath expression to evaluate on the object. If this is a scalar, it will be treated as a JSON string and parsed into the appropriate Perl data structure first. JSON object for which the expression will be evaluated. evaluate_jsonpathĮvaluate a JSONPath expression on the given object.
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You may also specify "perl" here, in which case the filter will be treated as Perl code. script_engineĭefaults to "PseudoJS", which is my clever name for a subset of Javascript- like operators for Boolean expressions. Useful if you want to use this to modify hashrefs / arrayrefs in place. Set this to true if you want a reference to the thing the JSONPath expression matches, rather than the value of said thing. JSONPath expressions will be evaluated with respect to this. Arguments may be specified in a hash or a hashref. My = evaluate_jsonpath( $obj, = "fiction")]}) Ĭonstructor for the object-oriented interface to this module. Use JSON::Path::Evaluator qw/evaluate_jsonpath/ Version 0.51 SYNOPSIS use JSON::MaybeXS qw/decode_json/ # Or whatever JSON thing you like. JSON::Path::Evaluator - A module that recursively evaluates JSONPath expressions with native support for Javascript-style filters VERSION